Just asking OP, what do you mean "to maintain it". This should run for years without any service. Except for the learning experience, which is not to be discounted, why are you messing with it after a just a few 100 miles. All sealed bearing cartridges there, nothing to do BUT mess it up. Just leave it be, and come back some years down the road when you really need to.

Okay, if you are a tinkerer and absolutely have to pull this apart to see what it is about, I understand. I'm just saying it isn't necessary or recommended. No other good can come of it.